#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;

class A
{
public:
	virtual void a() final
	{
		// ...
	}
};

class B :public A
{
public:
	virtual void a()
	{
		cout << "a()" << endl;
	}
};

int main()
{
	

	return 0;
} 